Research On Quantum Entanglement Dynamics And The Fast-slow Light Effects In Hybrid Optical Systems

Quantum entanglement is the most basic concept in quantum mechanics and the most valuable resource in the field of quantum information.For example,quantum coding,quantum teleportation,quantum error correction code,quantum network and quantum computation.Entanglement can be generated by different quantum systems such as the ion trap,cavity QED and linear optical systems.Cavity optomechanical system plays an important role in optical signal precision detection,quantum mechanics and quantum communication.The system can easily introduce some auxiliary systems represented by atomic,electrons and quantum dots to provide a good platform for the interaction between matter and light field.Among them,the introduction of atomic medium can effectively improve the nonlinear coupling between the light field and the mechanical oscillator,which will be beneficial to the study of some quantum characteristics of the cavity optical mechanical system,such as preparation of entangled states,the compressed state of the mechanical oscillator and electromagnetically induced transparency.Based on the development prospect of quantum entanglement and fast-slow light effect in the field of quantum communication,this paper mainly studies the entanglement dynamics and the fast-slow light effect in a hybrid optical system.The detailed contents are as follows:Firstly,we investigate the effective strong coupling and entanglement dynamics in cavity QED system coupled to an auxiliary cavity.The entanglement dynamics of two quantum emitters(such as a two-level atom)under various effective parameters are analyzed.It is find that strong coupling between the atom and the auxiliary cavity can be realized.Finally,we obtain the maximal entanglement between two atoms and the remote maximal entanglement between the atom and the auxiliary cavity.Secondly,we study the fast-slow light effects in a hybrid optomechanical system,in which a Fabry-Perot cavity is driven by a pump laser field and a weak probe laser field coupled to an auxiliary cavity.We find that by changing the cavity-pump field frequency detuning can realize the transformation of the fast-slow light effect.Moreover,the results show that the auxiliary cavity plays an important role in the hybrid system,which provides a quantum channel to affect the absorption of the probe field.At last,we propose an effective and accurate method to measure the coupling strength between the two cavities.